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MOSFET Amplifiers

MOSFET Amplifiers

The MOSFET, when operating in its active region, functions as a voltage-controlled current source. In this region, the gate-to-source voltage controls the drain current. This principle underlies the operation of the transconductance MOSFET amplifier. The output current is directed through a load resistor to convert this amplifier into a voltage amplifier. The output voltage is then obtained by subtracting the voltage drop across the load resistance from the supply voltage. This process results...

Small-Signal Analysis of MOSFET Amplifiers

Small-Signal Analysis of MOSFET Amplifiers

In small-signal analysis, a MOSFET transistor amplifier acts as a linear amplifier when operating in its saturation region. The gate-to-source voltage (VGS) of the MOSFET is the sum of the DC biasing voltage and the small time-varying input signal. This combination sets up the operating point and modulates the drain current (ID) that flows from the drain to the source. When a small AC signal is superimposed on the DC bias voltage at the gate, the instantaneous drain current comprises three...

BJT Amplifiers

BJT Amplifiers

Bipolar Junction Transistors (BJTs) are pivotal components in amplifier circuits, functioning as voltage-controlled current sources in their active region. This characteristic allows them to efficiently control the collector current through variations in the base-emitter voltage. Essentially, BJTs amplify power due to their ability to take a weak input signal and output a much stronger signal.
In BJT amplifier configurations, particularly in common-emitter setups, the transistor's role extends...

Small-Signal Analysis of BJT Amplifiers

Small-Signal Analysis of BJT Amplifiers

Small signal analysis is a fundamental approach used in electronics to understand how a Bipolar Junction Transistor (BJT) amplifier processes signals. In the active region, the BJT is designed for linear amplification. The transistor's behavior under these conditions is governed by its instantaneous base-emitter voltage VBE, a sum of the DC bias VBE, and a small AC signal VBE, resulting in the collector current iC. Here, the collector current has a DC component and an AC component.

Biasing of FET

Biasing of FET

Biasing a Junction Field Effect Transistor (JFET) is crucial for setting operational parameters and ensuring efficient functioning in electronic circuits. JFETs are characterized by using a single carrier type in N-channel or P-channel configurations, where the channel is surrounded by PN junctions. These junctions are central to the device's ability to control current flow.
In an N-channel JFET, the structure consists of N-type material forming the channel on a P-type substrate, with the gate...

Biasing of Metal-Semiconductor Junctions

Biasing of Metal-Semiconductor Junctions

Biasing metal-semiconductor junctions involves applying a voltage across the junction. Specifically, the metal is connected to a voltage source, while the semiconductor is grounded. This technique is essential for controlling the direction and magnitude of current flow in electronic devices, including diodes, transistors, and photovoltaic cells.
In Schottky junctions, where the semiconductor is n-type, applying a positive voltage to the metal relative to the semiconductor reduces its Fermi...

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Related Experiment Video

Updated: Jul 7, 2026

20 mJ, 1 ps Yb:YAG Thin-disk Regenerative Amplifier

20 mJ, 1 ps Yb:YAG Thin-disk Regenerative Amplifier

Published on: July 12, 2017

Narrow-linewidth master-oscillator power amplifier based on a semiconductor tapered amplifier.

A C Wilson, J C Sharpe, C R McKenzie

|February 21, 2008

Summary

A new laser system combines a grating-stabilized diode laser with a tapered amplifier, achieving 500 mW output power and narrow linewidth. This high-power, narrow-linewidth laser is ideal for advanced spectroscopy applications.

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Related Experiment Videos

Last Updated: Jul 7, 2026

20 mJ, 1 ps Yb:YAG Thin-disk Regenerative Amplifier

20 mJ, 1 ps Yb:YAG Thin-disk Regenerative Amplifier

Published on: July 12, 2017

Stimulated Stokes and Antistokes Raman Scattering in Microspherical Whispering Gallery Mode Resonators

Stimulated Stokes and Antistokes Raman Scattering in Microspherical Whispering Gallery Mode Resonators

Published on: April 4, 2016

Microwave Photonics Systems Based on Whispering-gallery-mode Resonators

Microwave Photonics Systems Based on Whispering-gallery-mode Resonators

Published on: August 5, 2013

Area of Science:

Atomic, Molecular, and Optical Physics
Laser Physics and Photonics

Background:

Grating-stabilized diode lasers offer narrow linewidths but limited output power.
Semiconductor tapered amplifiers can increase laser output power but often broaden the linewidth.

Purpose of the Study:

To develop a high-power, narrow-linewidth laser source by combining a master oscillator and a power amplifier.
To demonstrate the utility of this laser system for high-resolution spectroscopic measurements.

Main Methods:

Injected a grating-stabilized external-cavity diode laser into a semiconductor tapered amplifier (master-oscillator power amplifier configuration).
Characterized the output power and spectral linewidth of the amplified laser output.
Performed Doppler-free two-photon spectroscopy on rubidium atoms.

Main Results:

Achieved up to 500 mW of output power.
Maintained a narrow linewidth, with the tapered amplifier adding minimal additional broadening compared to the master oscillator.
Successfully demonstrated Doppler-free two-photon spectroscopy with the system.

Conclusions:

The master-oscillator power amplifier configuration effectively produces high-power, narrow-linewidth laser output.
This laser system is a valuable tool for precision spectroscopy, enabling advanced atomic physics experiments.